| | Malverne, NY | Belle Terre, NY | United States |
| Population | 8,583 | 791 | 329,725,481 |
| Female Population | 51.7% | 51.1% | 50.5% |
| Male Population | 48.3% | 48.9% | 49.5% |
| Median Age | 44.4 | 51.2 | 38.4 |
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| Population - 2010 | 8,529 | 790 | 309,327,143 |
| Population - 2000 | 8,934 | 832 | 285,036,114 |
| Population - 1990 | 9,054 | 839 | 251,960,433 |
| Pop. 2000 to Now | -5.3% | -5.7% | 15.6% |
| Pop. 1990 to Now | -6.6% | -6.4% | 30.8% |
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| Population Density | 8,112.5 | 893.8 | 93.4 |
| Land Area | 1.1 | 0.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Malverne, NY | Belle Terre, NY | United States |
| Age 0 to 4 | 6.9% | 2.1% | 5.9% |
| Age 5 to 9 | 4.3% | 5.8% | 6.1% |
| Age 10 to 14 | 5.2% | 9.5% | 6.6% |
| Age 15 to 17 | 3.0% | 5.4% | 3.9% |
| Age 18 to 20 | 2.8% | 1.4% | 4.0% |
| Age 21 to 24 | 3.7% | 1.6% | 5.2% |
| Age 25 to 34 | 9.9% | 5.6% | 13.8% |
| Age 35 to 44 | 14.6% | 7.6% | 12.9% |
| Age 45 to 54 | 12.7% | 15.6% | 12.6% |
| Age 55 to 59 | 8.1% | 9.4% | 6.7% |
| Age 60 to 64 | 8.8% | 7.3% | 6.3% |
| Age 65 to 74 | 13.0% | 15.2% | 9.6% |
| Age 75 to 84 | 4.0% | 10.1% | 4.5% |
| Age 85 and over | 3.0% | 3.4% | 1.9% |
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| Race | | | |
| | Malverne, NY | Belle Terre, NY | United States |
| White | 76.0% | 83.1% | 59.4% |
| Black | 4.3% | 4.7% | 12.2% |
| Asian | 3.5% | 4.2% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.9% | 0.4% |
| Two or More Races | 3.3% | 2.3% | 3.2% |
| Hispanic | 12.2% | 4.9% | 18.4% |
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| Marriage & Family | | | |
| | Malverne, NY | Belle Terre, NY | United States |
| Married Population | 63.6% | 73.0% | 49.8% |
| Currently Married | 62.6% | 73.0% | 48.0% |
| Married but Separated | 1.0% | 0.0% | 1.8% |
| Single Population | 36.4% | 27.0% | 50.2% |
| Never Married | 24.4% | 19.1% | 33.8% |
| Divorced | 5.0% | 2.9% | 10.8% |
| Widowed | 7.0% | 4.9% | 5.6% |
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| Household Size | 2.85 | 2.80 | 2.60 |
| Households | 3,013 | 282 | 124,010,992 |
| Family Households | 2,384 | 246 | 80,755,759 |
| Married couple, w/children | 32.2% | 32.1% | 30.5% |
| Married couple, no children | 51.1% | 65.0% | 42.9% |
| Non Family Households | 629 | 36 | 43,255,233 |
| Single householder, w/children | 5.7% | 2.4% | 15.8% |
| Single householder, no children | 11.1% | 0.4% | 10.8% |